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F4 power amplifier
F4 power amplifier
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Old 21st February 2020, 01:56 PM   #4551
cal3713 is offline cal3713
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Quote:
Originally Posted by nfsgame View Post
You've built a great RF-reveiver with those foil-resistors >1cm away from PCB with a "loop"-antenna... It's better to form the leads with two fine pliers so that the leads are as short as possible.
I am planning on building a "maxed out" F4 with the z-foil resistors too. Nice to see an example and get some feedback on how best to install.
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Old 25th March 2020, 06:07 PM   #4552
vdi_nenna is offline vdi_nenna  United States
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F4 power amplifier
Default Preamp for F4

Another preamp that works well with the F4 is the S5 Electronics K-PL kit.
This was my first tube build and it was pretty easy. Needs a 200v power supply and 6.3v for filaments. Antek has a dual 140v and dual 6.3v secondaries.
I used a 175v version, but had to drop the voltage by ~40v. The 140v will get you closer with less fuss.

K-PL uses a 5670 triode tube, however member (audiowise) recommended the 6922 with a cathode cap. Said 6922 will halve the output impedance. I will be trying th 6922 as well with a 60uF MKP. As-is it sounds pretty good.
I upgraded the main board parts for $25.

Price is right. Basic Bud chassis and other parts came to under $200.
It is my opinion that it sound way better than the price suggests.


S5 K-PL
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